1. First, check the official announcement: concerts usually release relevant information in official website or official Weibo, which may include information of security companies. You can check the official channels of the concert, such as the organizer's website or social media page, to find announcements or related information about security companies.
2. Secondly, consult the concert organizer: You can directly consult the concert organizer and ask which security company they are working with.
3. Finally, contact the concert venue: concerts are usually held in specific venues. You can try to contact the management of the concert venue and consult the security company they hired.